John conducted an experiment to test the effectiveness of a smoking cessation program. The experiment took place over a 1-month time period. Participants in the control group and the experimental group (those who participated in the smoking cessation program) recorded the number of cigarettes that they smoked each day. John was unaware that "national stop-smoking week" also happened to take place
during the 1-month time period of his experiment. John's experiment is now confounded by
a. maturation.
b. history.
c. regression to the mean.
d. mortality.
b
You might also like to view...
Suppose you have just read over an algebra problem, and you have now created an internal representation of the important information. According to the discussion of problem solving, you have mastered the stage called
a. problem finding. b. understanding. c. heuristic choice. d. background knowledge.
Based on various physical stressors, Hans Selye determined through autopsies that the rats in his experiments experienced common physiological patterns of change over time, such as reductions in the size of the thymus and lymph glands, enlarged adrenal cortexes, and ulcerated stomachs. He described these physiological changes as stress reactions. They were characterized as ____ because they
represented common patterns to a host of different stressors. a. generic responses c. physiological responses b. alarm responses d. non-specific responses Fill in the blank(s) with correct word
In which case is the self-esteem of an outsider (a student who is not associated with any of the crowds) relatively high?
A) When they are eager to belong to a crowd, but cannot gain acceptance B) When they give little importance to crowd membership C) When they are adopted as a new member of a crowd D) When they are actively rejected out of a crowd
According to the __________ theory, distinct receptors exist for the sensation of temperature
a. magnitude estimation b. place c. vascular d. specific receptor